Find the equation of the quadratic function in general form shown in the graph below.
A parabola on a coordinate plane.
A coordinate plane has a horizontal x-axis labeled from negative 7 to 7 in increments of 1 and a vertical y-axis labeled from negative 6 to 6 in increments of 1. A parabola labeled as f left-parenthesis x right-parenthesis that opens upward has a vertex at left-parenthesis 1.5 comma negative 6 right-parenthesis and passes through the plotted and labeled points left-parenthesis 0 comma negative 4 right-parenthesis; left-parenthesis negative 1 comma 0 right-parenthesis; and left-parenthesis 4 comma 0 right-parenthesis.
